126640839 has 16 divisors (see below), whose sum is σ = 182061152. Its totient is φ = 77839488.

The previous prime is 126640807. The next prime is 126640847. The reversal of 126640839 is 938046621.

It is not a de Polignac number, because 126640839 - 2⁵ = 126640807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 126640797 and 126640806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126640039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45969 + ... + 48645.

It is an arithmetic number, because the mean of its divisors is an integer number (11378822).

Almost surely, 2^126640839 is an apocalyptic number.

126640839 is a deficient number, since it is larger than the sum of its proper divisors (55420313).

126640839 is a wasteful number, since it uses less digits than its factorization.

126640839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 126640839 is about 11253.4811947237. The cubic root of 126640839 is about 502.1782817297.

The spelling of 126640839 in words is "one hundred twenty-six million, six hundred forty thousand, eight hundred thirty-nine".